Instruction Manual

► Lower the depth gauges (2) and tie straps (3)
with a STIHL USG universal sharpener using
the following settings:
–
Scale A: + 40°
–
Scale B: 0°
–
Scale C: 0°
17 Repairing
17.1 Repairing the Chain Saw,
Guide Bar and Saw Chain
The chain saw, guide bar and saw chain cannot
be repaired by the user.
► If the saw, guide bar or saw chain is damaged:
Do not use your saw, guide bar or saw chain,
and contact your STIHL servicing dealer.
18 Troubleshooting
18.1 Troubleshooting Chainsaw
Most malfunctions have the same causes.
► Perform the following operations:
► Clean the air filter.
► Clean or replace the spark plug.
► Adjust saw for winter or summer operation.
► If the malfunction still exists: Take the action described in the following table.
Condition Cause Remedy
Engine does not
start.
Insufficient fuel in the
tank.
► Mix fuel and refuel the chainsaw.
Engine is flooded. ► Clear the combustion chamber.
Carburetor is too hot. ► Allow chainsaw to cool down.
Carburetor is iced up. ► Allow saw to warm up to +10°C.
Engine idles errati‐
cally.
Carburetor is iced up. ► Allow saw to warm up to +10°C.
Engine stops while
idling
Carburetor is iced up. ► Allow saw to warm up to +10°C.
Poor acceleration The chain is over-ten‐
sioned.
► Tension chain properly.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
► Increase oil feed rate.
Engine does not
reach maximum
RPM.
Saw is not correctly
tuned to ambient con‐
ditions.
► Calibrate the saw.
Saw chain does not
rotate when throttle is
opened.
The chain brake is
engaged.
► Disengage the chain brake.
The chain is over-ten‐
sioned.
► Tension chain properly.
Bar nose sprocket is
blocked.
► Clean the bar nose sprocket with STIHL resin solvent.
Smoke or burning
smell while cutting.
Chain is not properly
sharpened.
► Sharpen the chain properly.
Insufficient chain oil
in the tank.
► Fill up with chain oil.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
► Increase oil feed rate.
17 Repairing English
0458-787-0121-B. VA0.M20. 23